The number of people who identify as transgender as reported by the New York Times. Copy downloaded on February 20, 2018. Article is at this link: https://www.nytimes.com/2016/07/01/health/transgender-population.html

Gallup poll concludes that Americans overestimate the percentage of the population who are gay or lesbian downloaded on February 20, 2018. Link to article: http://news.gallup.com/poll/183383/americans-greatly-overestimate-percent-gay-lesbian.aspx

Article from LA Times showing the DNA differences existing between gay and straight twin brothers downloaded from the LA Times on February 20, 2018. Link to article: http://www.latimes.com/science/sciencenow/la-sci-sn-genetic-homosexuality-nature-nurture-20151007-story.html